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AssuredElectrical, Master Electrician
Category: Electrical
Satisfied Customers: 4241
Experience:  Contractor-42+ Years in the ElectricalTrade
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Jason I'm an electrican and wanting to get the whole exhaust

Customer Question

Hi Jason I'm an electrican and wanting to get the whole exhaust fan with make up air electrical wiring understood. The ansul guy said it needs to be wired to a control, I'm guessing that's a micro switch connected to a shunt trip correct? Do you have a wiring diagram bits a single phase exhaust fan. Thanks Jason
Submitted: 2 years ago.
Category: Electrical
Expert:  AssuredElectrical replied 2 years ago.
Welcome. My name is ***** ***** would be glad to assist.
The ansul switches can be used with a shunt trip trip breaker to shutdown the
necessary items or it can be used to trigger contactors which in turn are supplying
power to the equipment. Either way is failsafe to turn off the electrical items, while at the
same time leaving the exhaust fan running to evacuate the smoke.
Below are a couple diagrams I uploaded for you.
Let me know anything further needed,
Customer: replied 2 years ago.
Can you explain this diagram, what I can tell is from shunt trip to common and after that is confusing. Thanks
Customer: replied 2 years ago.
Is it like this. Hot wire from shunt trip to common, normally open to receptacles, and normally closed to fan makeup air and lights?
Expert:  AssuredElectrical replied 2 years ago.
I posted 3 possible ways to set up an Ansul system, so you must first make a decision on what you need for your situation.
Not sure why the confusion, just follow the power flow and it leads you the entire path of the circuit.
On a shunt trip breaker:
Power will go to the common point on the trip switch
The NO (normally open) contact point connects to the shunt trip terminal or wire on the shunt trip breaker (NO closes when the fire switch is activated)
Neutral connects directly to the shunt trip
Thats is it for a shunt trip breaker.
The breaker looks normal except it has a shunt coil inside to trip the breaker
So, you apply power to the shunt coil and it trips the main contacts on the breaker
So, you let me know which way you plan and we can go from there
Customer: replied 2 years ago.
Ok let me talk to ansul guy and get more details thanks!
Expert:  AssuredElectrical replied 2 years ago.
Ok, very good. Thanks
Customer: replied 2 years ago.
Hello tommy, ok so basically he needs the make up air, lights, and oven under hood to go off during emergency(when breaker is tripped) and exhaust fan to stay on.
Expert:  AssuredElectrical replied 2 years ago.
So now, you have to know how those items are powered in order to interrupt them in a fire situation.
Will the intake fan, exhaust fan, and oven be on their own circuit breakers?
Or will contactors be used to operate them with 120 volts through the ansul?
Will the lights be direct wired through a switch?
Is the Ansul a single switch or dual switch?
Those questions have to be answered in order to determine the wiring, that is why I posted several general wiring configurations, so you can use them to decide.